What is the climax of Fever 1793?

I would say
it's when Mattie's grandfather dies. At this point, she has to decide what she's going to do.
Her life from before is gone, and at first she just wanders the streets of Philadelphia. When
she find Nell, she finds a purpose in life. She joins Eliza in her fight, and Eliza allows her
to become an adult. Mattie rebuilds the coffeehouse, takes care of Nell, and her mother when she
returns. Her grandfather's death was the point where Mattie had to grow up and take
responsibility for herself and others.